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-
-<title>Access Control - Configure - H2O - the optimized HTTP/2 server</title>
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-<body>
-<div id="body">
-<div id="top">
-
-<h1>
-<a href="index.html">H2O</a>
-</h1>
-<p class="description">the optimized HTTP/1.x, HTTP/2 server</p>
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-<td><a href="index.html">Top</a></td>
-<td><a href="install.html">Install</a></td>
-<td class="selected">Configure</td>
-<td><a href="faq.html">FAQ</a></td>
-<td><a href="http://blog.kazuhooku.com/search/label/H2O" target="_blank">Blog</a></td>
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-<h2>
-<a href="configure.html">Configure</a> &gt;
-Access Control
-</h2>
-
-
-<p>
-Starting from version 2.1, H2O comes with a DSL-like mruby library which makes it easy to write access control list (ACL).
-</p>
-
-<h2 id="example" class="section-head">Example</h2>
-
-<p>
-Below example uses this Access Control feature to write various access control.
-</p>
-
-<div class="example">
-<div class="caption">Example. Access Control</div>
-<pre><code>paths:
- &quot;/&quot;:
- mruby.handler: |
- acl {
- allow { addr == &quot;127.0.0.1&quot; }
- deny { user_agent.match(/curl/i) &amp;&amp; ! addr.start_with?(&quot;192.168.&quot;) }
- respond(503, {}, [&quot;Service Unavailable&quot;]) { addr == malicious_ip }
- redirect(&quot;https://example.com/&quot;, 301) { path =~ /moved/ }
- use Htpasswd.new(&quot;/path/to/.htpasswd&quot;, &quot;realm&quot;) { path.start_with?(&quot;/admin&quot;) }
- }
- file.dir: /path/to/doc_root
-</code></pre>
-</div>
-
-
-<p>
-In the example, the handler you get by calling <code>acl</code> method will do the following:
-<ul>
- <li>
- if the remote IP address is exactly equal to "127.0.0.1", the request will be delegated to the next handler (i.e. serve files under /path/to/doc_root) and all following acl settings are ignored
- </li>
- <li>
- otherwise, if the user agent string includes "curl" and the remote IP address doesn't start with "192.168.", this handler immediately returns <code>403 Forbidden</code> response
- </li>
- <li>
- otherwise, if the remote IP address is exactly equal to the <code>malicious_ip</code> variable, this handler immediately returns <code>503 Service Unavailable</code> response
- </li>
- <li>
- otherwise, if the request path matches with the pattern <code>/moved/i</code>, this handler immediately redirects the client to <code>"https://example.com"</code> with <code>301</code> status code
- </li>
- <li>
- otherwise, if the request path starts with <code>/admin</code>, apply Basic Authentication to the request (for details of Basic Authentication, see <a href="configure/basic_auth.html">here</a>).
- </li>
- <li>
- otherwise, the request will be delegated to the next handler (i.e. serve files under /path/to/doc_root)
- </li>
-
-</ul>
-
-<h2 id="acl-methods" class="section-head">ACL Methods</h2>
-
-<p>
-An ACL handler is built by calling ACL methods, which can be used like directives.
-ACL methods can only be used in <code>acl</code> block.
-</p>
-
-<p>
-Each ACL method adds a filter to the handler, which checks whether the request matches the provided condition or not.
-Every ACL method can be accompanied by a condition block, which should return boolean value.
-</p>
-
-<p>
-The filter defined by the method that first matched the accompanying condition gets applied (e.g. response <code>403 Forbidden</code>, redirect to somewhere).
-If a condition block is omitted, all requests matches.
-If none of the conditions matches the request, the handler returns <code>399</code> and the request will be delegated to the next handler.
-</p>
-
-<div id="allow" class="mruby-method-head">
-<h3><a href="configure/access_control.html#allow"><code>"allow"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Adds a filter which delegates the request to the next handler if the request matches the provided condition.
-</p>
-
-<pre><code>allow { ..condition.. }</code></pre>
-
-</dd>
-</dl>
-
-<div id="deny" class="mruby-method-head">
-<h3><a href="configure/access_control.html#deny"><code>"deny"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Adds a filter which returns <code>403 Forbidden</code> if the request matches the provided condition.
-</p>
-
-<pre><code>deny { ..condition.. }</code></pre>
-
-</dd>
-</dl>
-
-<div id="redirect" class="mruby-method-head">
-<h3><a href="configure/access_control.html#redirect"><code>"redirect"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Adds a filter which redirects the client if the request matches the provided condition.
-</p>
-
-<pre><code>redirect(location, status) { ..condition.. }</code></pre>
-
-</dd>
-<dt>Parameters:</dt>
-<dd>
-<dl class="mruby-method-parameters">
- <dt>location</dt>
- <dd>Location to which the client will be redirected. Required.</dd>
- <dt>status</dt>
- <dd>Status code of the response. Default value: 302</dd>
-</dl>
-</dd>
-</dl>
-
-<div id="respond" class="mruby-method-head">
-<h3><a href="configure/access_control.html#respond"><code>"respond"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Adds a filter which returns arbitrary response if the request matches the provided condition.
-</p>
-
-<pre><code>respond(status, header, body) { ..condition.. }</code></pre>
-
-</dd>
-<dt>Parameters:</dt>
-<dd>
-<dl class="mruby-method-parameters">
- <dt>status</dt>
- <dd>Status code of the response. Required.</dd>
- <dt>header</dt>
- <dd>Header key-value pairs of the response. Default value: {}</dd>
- <dt>body</dt>
- <dd>Body array of the response. Default value: []</dd>
-</dl>
-</dd>
-</dl>
-
-<div id="use" class="mruby-method-head">
-<h3><a href="configure/access_control.html#use"><code>"use"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Adds a filter which applies the provided handler (callable object) if the request matches the provided condition.
-</p>
-
-<pre><code>use(proc) { ..condition.. }</code></pre>
-
-</dd>
-<dt>Parameters:</dt>
-<dd>
-<dl class="mruby-method-parameters">
- <dt>proc</dt>
- <dd>Callable object that should be applied</dd>
-</dl>
-</dd>
-</dl>
-
-<h2 id="matching-methods" class="section-head">Matching Methods</h2>
-
-<p>
-In a condition block, you can use helpful methods which return particular properties of the request as string values.
-Matching methods can only be used in a condition block of the ACL methods.
-</p>
-
-<div id="addr" class="mruby-method-head">
-<h3><a href="configure/access_control.html#addr"><code>"addr"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Returns the remote IP address of the request.
-</p>
-
-<pre><code>addr(forwarded)</code></pre>
-
-</dd>
-<dt>Parameters:</dt>
-<dd>
-<dl class="mruby-method-parameters">
- <dt>forwarded</dt>
- <dd>If true, returns the value of X-Forwarded-For header if it exists. Default value: true</dd>
-</dl>
-</dd>
-</dl>
-
-<div id="path" class="mruby-method-head">
-<h3><a href="configure/access_control.html#path"><code>"path"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Returns the requested path string of the request.
-</p>
-
-<pre><code>path()</code></pre>
-
-</dd>
-</dl>
-
-<div id="method" class="mruby-method-head">
-<h3><a href="configure/access_control.html#method"><code>"method"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Returns the HTTP method of the request.
-</p>
-
-<pre><code>method()</code></pre>
-
-</dd>
-</dl>
-
-<div id="header" class="mruby-method-head">
-<h3><a href="configure/access_control.html#header"><code>"header"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Returns the header value of the request associated with the provided name.
-</p>
-
-<pre><code>header(name)</code></pre>
-
-</dd>
-<dt>Parameters:</dt>
-<dd>
-<dl class="mruby-method-parameters">
- <dt>name</dt>
- <dd>Case-insensitive header name. Required.</dd>
-</dl>
-</dd>
-</dl>
-
-<div id="user_agent" class="mruby-method-head">
-<h3><a href="configure/access_control.html#user_agent"><code>"user_agent"</code></a></h3>
-</div>
-
-<dl class="mruby-method-desc">
-<dt>Description:</dt>
-<dd>
-<p>
- Shortcut for header("user-agent").
-</p>
-
-<pre><code>user_agent()</code></pre>
-
-</dd>
-</dl>
-
-<h2 id="caution" class="section-head">Caution</h2>
-
-<p>
-Several restrictions are introduced to avoid misconfiguration when using <code>acl</code> method.
-<ul>
-<li><code>acl</code> method can be called only once in each handler configuration</li>
-<li>If <code>acl</code> method is used, the handler returned by the configuration directive must be the one returned by the <code>acl</code> method</li>
-</ul>
-If a configuration violates these restrictions, the server will detect it and refuse to launch with error message.
-</p>
-
-<p>
-For example, both of the following examples violate the restrictions above, so the server will refuse to start up.
-</p>
-
-<div class="example">
-<div class="caption">Example. Misconfiguration Example 1</div>
-<pre><code>paths:
- &quot;/&quot;:
- mruby.handler: |
- acl { # this block will be ignored!
- allow { addr == &quot;127.0.0.1&quot; }
- }
- acl {
- deny
- }
- file.dir: /path/to/doc_root
-</code></pre>
-</div>
-
-
-<div class="example">
-<div class="caption">Example. Misconfiguration Example 2</div>
-<pre><code>paths:
- &quot;/&quot;:
- mruby.handler: |
- acl { # this block will be ignored!
- allow { addr == &quot;127.0.0.1&quot; }
- deny
- }
- proc {|env| [399, {}, []}
- file.dir: /path/to/doc_root
-</code></pre>
-</div>
-
-
-<p>
-You can correct these like the following:
-</p>
-
-<div class="example">
-<div class="caption">Example. Valid Configuration Example</div>
-<pre><code>paths:
- &quot;/&quot;:
- mruby.handler: |
- acl {
- allow { addr == &quot;127.0.0.1&quot; }
- deny
- }
- file.dir: /path/to/doc_root
-</code></pre>
-</div>
-
-
-<h2 id="how-to" class="section-head">How-To</h2>
-
-<h3 id="matching-ip-address-blocks">Matching IP Address Blocks</h3>
-
-<p>
-You can match an IP address against predefined list of address blocks using a script named <a href="">trie_addr.rb</a>.
-</p>
-<p>
-Below is an example.
-</p>
-
-<div class="example">
-<div class="caption">Example. Address Block Matching Example</div>
-<pre><code>paths:
- &quot;/&quot;:
- mruby.handler: |
- require &quot;trie_addr.rb&quot;
- trie = TrieAddr.new.add([&quot;192.168.0.0/16&quot;, &quot;172.16.0.0/12&quot;])
- acl {
- allow { trie.match?(addr) }
- deny
- }
- file.dir: /path/to/doc_root
-</code></pre>
-</div>
-
-
-<p>
-This library currently supports only IPv4 addresses. <code>TrieAddr#match?</code> returns <code>false</code> when it receives an invalid IPv4 address (including an IPv6 address) as an argument..
-</p>
-
-
-
-
-</div>
-<div id="footer">
-<p>
-Copyright &copy; 2015 <a href="http://dena.com/intl/">DeNA Co., Ltd.</a> et al.
-</p>
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